I am also considered high risk.
I have very large babies-my first was 23", 10lbs, 4oz and 23" long with a very large bone structure. It was an assisted delivery (vaccuum extraction) and she/we had problems getting her shoulders delivered-that injured us both. I had postpartum hemhorrage (sp?) with my first and had to have emergency surgery afterwards to stop the bleeding.
My second was induced/delivered almost 4 weeks early due to size, and he was still larger than normal-over 9 pounds with the same bone structure as my daughter.
I have problems with gestational diabetes as well, and due to my last two experiences, they are monitoring this baby and its size carefully. I am at 26 weeks, and he is still breech, and measuring larger than normal right now-so the trend of big babies is continuing.
Of course, if he stays breech-they have to do a c-section, but if his size continues to increase as well-then they are more likely to do a c-section this time around, rather than having me deliver naturally. They are trying to avoid some of the problems I have had in the past due to the vaginal deliveries that I had with my former doctors. (but really shouldn't have.)